Hemet w



H. W. GOULD.

ROASTING FURNACE.

APPLICATION FILED MAY 29. I918.

Patented Oct. 28, 1919.

INVENTOR. HEW/F). W. 00417.

Q I ATTORNEYS HENRY W.

GOULD, OF SAN FEMQNGISCD, CALIFORNIA.

ROASTING-FURNACE Specification oi hetters Eatent.

Patented @ct. 28, 1919.

Application filed May 29,. i918. Serial No. 237,310.

To all whom it may concern:

Be it known that'l, HENRY WV. Goon), a citizen of the United States, andaresident of the city and county of San Francisco, State of California,have invented a certain new and useful Roasting-Furnace, of which thefollowing is a specification.

The invention relates to roasting furnaces for ore or other minerals andparticularly furnaces of the rotary type.

An object of the invention is to provide means for controlling the airentering the furnace.

Another object of the invention is to provide means for transferringheat from the material discharged from the furnace, to the air enteringthe furnace.

The invention possesses other advantagcous features, some of which, withthe foregoing, will be set forth at length in the following descriptionwhere I shall outline in full, that form of the invention which I haveselected for illustration in the drawings accompanying and formingpartof the present specincation. in said drawings 1' have shown onespecific form of the furnace of my invention, but it is to be understoodthat I do not limit myself to such form, since the invention, asexpressed. in the claims, may be embodied in a plurality of forms.

Referring to said drawings:

Figure 1 is a side elevation of the furnace of my invention.

Fig. 2 is a detaii, partly in section, showing the connection betweenthe rotary lriin and the fire hex.

3 is a longitudinai section through the sealing rings the lower end ofthe kiln.

Fig. 4- an elevation c is a... elevation of sealing per end the is crosssection on the iine 6,

furnace of my invention comprises inclined rotary kiln 2, suita linedsuitably supported. and provi able means for rotating it. At its iowerthe kiln extends into the fire he 3 i c may be constructed for bur weedor coai, or which may he provio with an fuci burner "or directing a nameinto lriin. its upper end the iriln is connect-"d to chamber orcollecting chamber which the hot "1a" into which the products ofcombustion and gases and vapors produced in the kiln pass. Means areprovided for producing substantially air tight joints between the kilnand the fire box and chamber 5, so thatthe air which enters the kiln maybe controlled. Secured to the face of the fire box and surrounding thekiln 2 is a face ring 6 having a face perpendicular to the axis ofrotation of the kiln. Secured to the kiln is an angle ring 7 andengaging the angle ring i a second angle ring 8 contacting with the facering 6. The ring 8 is held in tight contact with the face ring 6 by thesprings 9, which also permit a lateral movement of the ring 8 withrespect to the kiln. The two angle rings form a substantially tightsliding fit and the ring 8 forms a substantially tight running fit withthe face ring, so that the joint between the kiln and the fire boxissubstantially air tight. Bolts 12 secured to the ring 8 and.extendingthrough apertures in ring *4" cause said rings to rotatetogether.

Secured to the face of the chamber 5 and surrounding the upper end ofthe kiln is a face ring 13 having its face perpendicular to the axis ofrotation of the kiln. Rotatably engaging and forming a tight running fitwith the face ring 13, is an angle ring 14 which is rotatable with andmovable laterally with respect to the ring 15, secured to the upper endof the kiln. Bolts 16 engaging the ring 15 and extending through iateraiapertures in the ring it produce rotation. and permit lateral movement.Springs 1? arranged in se is 18 on the ring 1% and engaging adjustableabutments on ring 15, hold the ring 1% pressed tightiy against the facering 13, forming a substantialiy joint between the h the chamber 5.

The ore or niateriai to be i into the upper en feed con 3t chamber 5provided with produces a steepe maining iortior 1 .1. .Q 1e rota-tie oit1 eri below com:

'31.. is a chute or 't a .111. a,

the hot material and the air for completing combustion of the fuelenters the fire box through this chute, so that the air is heated to avery high degree before it enters the fire box. In this mannersubstantially all of the heat in ithe discharged material i'sjtransferred to the air, thereby producing a large saving in heat. Theair enters the chute through the conduit which is provided with a valve26, so that the amount of air entering the chute may be controlled.

I claim:

1. A furnace comprising a rotatable kiln, a fire box arranged at one endof said kiln, means for sealing the joint between the fire box and therotatable kiln, a chamber connected to said fire box into which hotmaterial from the kiln discharges and means for admitting air into thehot material in said chamber.-

2. A furnace comprising a rotatable kiln substantially sealed againstthe entrance of extraneous air and means for passing air in controllablequantity into said kiln through a body of hot material discharged fromsaid kiln.

3. A furnace comprising a rotatable inclined kiln, a fire box arrangedat the lower -material discharged from said kiln, and

means for passing a1r in controllable quantities through said hotmaterial and into the fire box.

A furnace comprising an inclined rotary cyllndrical kiln, the upper endof said kiln being conical, means for introducing material into saidconical end and means for introducing heat into the lower end of thekiln.

5. A furnace comprising a rotatable kiln, a fire box associated with thekiln and having an opening through which hot material from the kiln isdischarged and means for introducing air into the fire box through thedischarge opening.

In testimony whereof, I have hereunto set my hand at San Francisco,California, this 16th day of May, 1918.

HENRY WV. GOULD.

In presence of H. G. PRosT.

